46295 + Interview Questions in Chemistry

1.	The total value of m for the electrons (n=4) is:- (1)4 (2)8 (3)16 (4)32
Answer» The total value of m for the electrons (n=4) is:- (1)4 (2)8 (3)16 (4)32

Discussion

2.	Which is more stable, NaCl or AlCl3?
Answer» Which is more stable, NaCl or AlCl3?

Discussion

3.	2. 0.30g of an organic compound containing C, H, O on combustion gives 0.44gCO2,0.18gH2O.If the molecular mass of the compound is 60u, what is the molecular formula?
Answer» 2. 0.30g of an organic compound containing C, H, O on combustion gives 0.44gCO2,0.18gH2O.If the molecular mass of the compound is 60u, what is the molecular formula?

Discussion

4.	8. How much should the pressures be increased in order to decrease the volume of gas by 5% at constant temperature 5% 5.26% 10% 4.26%
Answer» 8. How much should the pressures be increased in order to decrease the volume of gas by 5% at constant temperature 5% 5.26% 10% 4.26%

Discussion

5.	Which of the following statement(s) is/are correct?
Answer» Which of the following statement(s) is/are correct?

Discussion

6.	31.C6H5ONa + C2H5Cl --> Give the product formed.
Answer» 31.C6H5ONa + C2H5Cl --> Give the product formed.

Discussion

7.	The time for half-life period of a certain reaction ,A→ products is 1h.When the initial concentration of the reac†an t 'A' is 2.0 mol L^{-1},how much time does it take for its concentration to come from 0.50 to 0.25 mol L^{-1}, if it is a zero order reaction
Answer» The time for half-life period of a certain reaction ,A→ products is 1h.When the initial concentration of the reac†an t 'A' is 2.0 mol L^{-1},how much time does it take for its concentration to come from 0.50 to 0.25 mol L^{-1}, if it is a zero order reaction

Discussion

8.	117.The root mean square velocity of hydrogen molecule at 27^°C is vh and that of oxygen at 402^°C is vo then what's the ratio of vh and vo?
Answer» 117.The root mean square velocity of hydrogen molecule at 27^°C is vh and that of oxygen at 402^°C is vo then what's the ratio of vh and vo?

Discussion

9.	When a change is brought about in pressure, temperature or concentration of a reversible reation which has attained equilibrium, the equilibria tries to shift in such a direction which would neutralize the effect of change. This is known as
Answer» When a change is brought about in pressure, temperature or concentration of a reversible reation which has attained equilibrium, the equilibria tries to shift in such a direction which would neutralize the effect of change. This is known as

9.

When a change is brought about in pressure, temperature or concentration of a reversible reation which has attained equilibrium, the equilibria tries to shift in such a direction which would neutralize the effect of change. This is known as

Answer»

When a change is brought about in pressure, temperature or concentration of a reversible reation which has attained equilibrium, the equilibria tries to shift in such a direction which would neutralize the effect of change. This is known as

Discussion

10.	For which of the following reaction, KpKc ratio is maximum?
Answer» For which of the following reaction, $\frac{K_{p}}{K_{c}}$ ratio is maximum?

Discussion

11.	in which of the following metamerism is not possible?(a)C4H10O(b)C4H11N(c)C5H10O(d)C3H7ClGIVE REASON.
Answer» in which of the following metamerism is not possible? (a)C4H10O (b)C4H11N (c)C5H10O (d)C3H7Cl GIVE REASON.

Discussion

12.	49. C6H5Cl is least reactive towards OH- what is the reason?
Answer» 49. C6H5Cl is least reactive towards OH- what is the reason?

Discussion

13.	100 ml of a gaseous hydrocarbon on complete combustion gave 300 ml of co2 (g) . The no of atoms of carbon per molecule of the hydrocarbon would be A.1 B.2 C.3 D.4
Answer» 100 ml of a gaseous hydrocarbon on complete combustion gave 300 ml of co2 (g) . The no of atoms of carbon per molecule of the hydrocarbon would be A.1 B.2 C.3 D.4

Discussion

14.	1.What is the number of surrounding atoms of each carbon atom in ethyne?
Answer» 1.What is the number of surrounding atoms of each carbon atom in ethyne?

Discussion

15.	Calculate the molality of a 1 L soluttion of 93% H2SO4 (w/V) . The density of the solution is 1.84 g mL−1
Answer» Calculate the molality of a $1 L$ soluttion of $93 % H_{2} S O_{4}$ (w/V) . The density of the solution is $1.84 g m L^{- 1}$

Discussion

16.	20.what is the basic approach to find colourless/ coloured species ? it is correct to find the unpaired electron if present then coloured otherwise not
Answer» 20.what is the basic approach to find colourless/ coloured species ? it is correct to find the unpaired electron if present then coloured otherwise not

Discussion

17.	What is dry hydrogen chloride?
Answer» What is dry hydrogen chloride?

Discussion

18.	Mechanism for reduction of benzoic acid using LiAlH4
Answer» Mechanism for reduction of benzoic acid using LiAlH4

Discussion

19.	Select the right expression for determining the Packing fraction (PF) of NaCl unit cell (assume an ideal crystal), if the ions along an edge diagonal are absent: (Where r+ represents the radius of the cation and r− represents the radius of the anion)
Answer» Select the right expression for determining the Packing fraction (PF) of NaCl unit cell (assume an ideal crystal), if the ions along an edge diagonal are absent: (Where $r_{+}$ represents the radius of the cation and $r_{-}$ represents the radius of the anion)

Discussion

20.	At 90∘C, pure water has[H3O+]=10−6 molL−1. What is the value of Kw at 90∘C?
Answer» At $90^{\circ} C,$ pure water has $[H_{3} O^{+}] = 10^{- 6} m o l L^{- 1} .$ What is the value of $K_{w}$ at $90^{\circ} C ?$

Discussion

21.	The dipole moment of phenol is smaller than that of methanol. Why?
Answer» The dipole moment of phenol is smaller than that of methanol. Why?

Discussion

22.	The value of vanderwaal’s constant ‘a’ for the gases O2,N2,NH3 and CH4 are 1.360, 1.390, 4.170 and 2.253 L2 atm mol−2 respectively. The gas which can most easily be liquefied is
Answer» The value of vanderwaal’s constant ‘a’ for the gases $O_{2}, N_{2}, N H_{3} a n d C H_{4}$ are 1.360, 1.390, 4.170 and 2.253 $L^{2}$ atm $m o l^{- 2}$ respectively. The gas which can most easily be liquefied is

Discussion

23.	why does resonance in air column occur repeatedly in the ratio of 1:3:5:7 and so o
Answer» why does resonance in air column occur repeatedly in the ratio of 1:3:5:7 and so o

Discussion

24.	Fill in the blanks with a suitable conjunction. Do good unto others………... forget.
Answer» Fill in the blanks with a suitable conjunction. Do good unto others………... forget.

24.

Fill in the blanks with a suitable conjunction. Do good unto others………... forget.

Answer»

Fill in the blanks with a suitable conjunction.

Do good unto others………... forget.

Discussion

25.	The concentration of hole electron pair in pure silicon at T=300 K is 7×1015 per cubic meter. Antimony is doped into silicon in proportion 1 atom in 107 atoms. Assuming that half of the impurity atoms contribute electrons in the conduction band. Calculate the factor by which the number of charge carriers increases due to doping. Given that the number of silicon atom per cubic meter is 14×1028.
Answer» The concentration of hole electron pair in pure silicon at $T = 300 K$ is $7 \times 10^{15}$ per cubic meter. Antimony is doped into silicon in proportion $1$ atom in $10^{7}$ atoms. Assuming that half of the impurity atoms contribute electrons in the conduction band. Calculate the factor by which the number of charge carriers increases due to doping. Given that the number of silicon atom per cubic meter is $14 \times 10^{28} .$

Discussion

26.	A compound 'X' containing C,H and O is unreactive towards sodium. It does not add with bromine. It also does not react with Schiff's reagent. On refluxing with an excess of HI, 'X' yields only one organic product 'Y'. 'Y' on hydrolysis yields a new compound 'Z' which can be converted into 'Y' by reaction with red phosphorus and iodine. The compound 'Z' on oxidation with potassium permanganate gives a carboxylic acid. The equivalent weight of acid is 60. Write chemical equations leading to the conversion of 'X' to 'Y'.
Answer» A compound ' $X$ ' containing $C, H$ and $O$ is unreactive towards sodium. It does not add with bromine. It also does not react with Schiff's reagent. On refluxing with an excess of $H I,$ ' $X$ ' yields only one organic product ' $Y$ '. ' $Y$ ' on hydrolysis yields a new compound ' $Z$ ' which can be converted into ' $Y$ ' by reaction with red phosphorus and iodine. The compound ' $Z$ ' on oxidation with potassium permanganate gives a carboxylic acid. The equivalent weight of acid is $60.$ Write chemical equations leading to the conversion of ' $X$ ' to ' $Y$ '.

Discussion

27.	What is discontinuous variation??
Answer» What is discontinuous variation??

Discussion

28.	Draw the structure of a hexadentate ligand and show the donor atoms. (2)
Answer» Draw the structure of a hexadentate ligand and show the donor atoms. (2)

Discussion

29.	A catalytic poison renders the catalyst ineffective because
Answer» A catalytic poison renders the catalyst ineffective because

Discussion

30.	if 8 gm O2 diffuses from a pin hole how much H2 will diffuse under similar condition
Answer» if 8 gm O2 diffuses from a pin hole how much H2 will diffuse under similar condition

Discussion

31.	Which of the following compounds has the lowest boiling point?
Answer» Which of the following compounds has the lowest boiling point?

Discussion

32.	100 mL of 0.01 M CH3COOH and 200 mL of 0.02 M CH3COONa are mixed to form a buffer solution. 700 mL of water is added to this solution. The pH before and after dilution are:(pKa = 4.74, log 4 =0.6)
Answer» $100$ mL of $0.01$ M $C H_{3} C O O H$ and $200$ mL of $0.02$ M $C H_{3} C O O N a$ are mixed to form a buffer solution. $700$ mL of water is added to this solution. The pH before and after dilution are: (pKa = 4.74, log 4 =0.6)

Discussion

33.	Consider the fission of byfast neutrons. In one fission event, no neutrons are emitted and thefinal end products, after the beta decay of the primary fragments,are and.Calculate Q for this fission process. The relevant atomic andparticle masses are m=238.05079 um=139.90543 um= 98.90594 u
Answer» Consider the fission of by fast neutrons. In one fission event, no neutrons are emitted and the final end products, after the beta decay of the primary fragments, are and. Calculate Q for this fission process. The relevant atomic and particle masses are m =238.05079 u m =139.90543 u m = 98.90594 u

33.

Consider the fission of byfast neutrons. In one fission event, no neutrons are emitted and thefinal end products, after the beta decay of the primary fragments,are and.Calculate Q for this fission process. The relevant atomic andparticle masses are m=238.05079 um=139.90543 um= 98.90594 u

Answer»

Consider the fission of
by
fast neutrons. In one fission event, no neutrons are emitted and the
final end products, after the beta decay of the primary fragments,
are

and.
Calculate Q for this fission process. The relevant atomic and
particle masses are

m
=238.05079 u

m
=139.90543 u

m
= 98.90594 u

Discussion

34.	57 0.1 M solution of glucose was found to be isotonic with a solution of X in 100 g water.Calculate relative lowering in vapour pressure of solution of X in water.
Answer» 57 0.1 M solution of glucose was found to be isotonic with a solution of X in 100 g water.Calculate relative lowering in vapour pressure of solution of X in water.

Discussion

35.	Write any four methods to cook raw food items.
Answer» Write any four methods to cook raw food items.

Discussion

36.	When an electron is added to the neutral isolated atom, energy is given out. It is an exothermic process. In this process, monoanion is formed. Electron affinity of an element is defined as the amount of energy liberated when an electron is added to the neutral isolated atom in its ground state. Greater the amount of energy released, greater is the electron affinity. Electron affinity is expressed in terms of eVatom−1 or Kcal or kJmol−1.Electron affinity of elements depends on which of the following?
Answer» When an electron is added to the neutral isolated atom, energy is given out. It is an exothermic process. In this process, monoanion is formed. Electron affinity of an element is defined as the amount of energy liberated when an electron is added to the neutral isolated atom in its ground state. Greater the amount of energy released, greater is the electron affinity. Electron affinity is expressed in terms of $e V a t o m^{- 1}$ or $K c a l$ or $k J m o l^{- 1}$ . Electron affinity of elements depends on which of the following?

Discussion

37.	The set of values of x for which the function f(x)=log[x+12]\|x2−5x+6\| is defined is (where [.] denote the greatest integer function)
Answer» The set of values of $x$ for which the function $f (x) = {log}_{[x + \frac{1}{2}]} \| x^{2} - 5 x + 6 \|$ is defined is (where [.] denote the greatest integer function)

Discussion

38.	The IUPAC name of the compound CH2(COOH)2 is
Answer» The IUPAC name of the compound $C H_{2} (C O O H)_{2}$ is

Discussion

39.	CH3C≡CHNaNH2−−−−−→XCH2CH2Br−−−−−−−→Y. Identify the product 'Y' is
Answer» $C H_{3} C \equiv C H N a N H_{2} - ---- \to X C H_{2} C H_{2} B r - ------ \to Y .$ Identify the product 'Y' is

Discussion

40.	27.A: 2- bromo butane on reaction with alcoholic koh mainly gives 2- butene R: the hydrogen on c3 carbon is more acidic than the hydrogen on c1 carbon
Answer» 27.A: 2- bromo butane on reaction with alcoholic koh mainly gives 2- butene R: the hydrogen on c3 carbon is more acidic than the hydrogen on c1 carbon

Discussion

41.	Did Dobereiner's triads also exist in the columns of Newlands octaves
Answer» Did Dobereiner's triads also exist in the columns of Newlands octaves

Discussion

42.	NaCl is ionic solid, edge length of NaCl is x then the number of atoms which are located at the face centre of the unit cell in 58.5 g of NaCl is equal to ×1023atoms.
Answer» $N a C l$ is ionic solid, edge length of $N a C l$ is $x$ then the number of atoms which are located at the face centre of the unit cell in 58.5 g of $N a C l$ is equal to $\times 10^{23} a t o m s .$

Discussion

43.	A nucleus with mass number 240 breaks into two fragments, each of mass number 120. The binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. Energy released in the process is
Answer» A nucleus with mass number $240$ breaks into two fragments, each of mass number $120$ . The binding energy per nucleon of unfragmented nuclei is $7.6 MeV$ while that of fragments is $8.5 MeV .$ Energy released in the process is

Discussion

44.	A particle with mass m is held in circular orbit around the origin by an attractive force F(r)=-Dr; where D is a positive constant. Assume that the Bohr model idea that ,the angular momentum is quantized i.e. it takes only integral multiples of h2π holds. The value of energy in the nth orbit (Let the potential energy be zero when r = 0)
Answer» A particle with mass m is held in circular orbit around the origin by an attractive force F(r)=-Dr; where D is a positive constant. Assume that the Bohr model idea that ,the angular momentum is quantized i.e. it takes only integral multiples of $\frac{h}{2 π}$ holds. The value of energy in the $n^{t h}$ orbit (Let the potential energy be zero when r = 0)

Discussion

45.	2. In certain solidthe oxide ions are arranged in CCP cation a ocvupy 1/6 pgf tetrahedral void a n cation b occupy 1 third of octahedral void formula of compond is .
Answer» 2. In certain solidthe oxide ions are arranged in CCP cation a ocvupy 1/6 pgf tetrahedral void a n cation b occupy 1 third of octahedral void formula of compond is .

Discussion

46.	43) The set of compounds in which thereactivity of halogen atom in the ascendingorder isa) vinyl chloride < chloroethane
Answer» 43) The set of compounds in which thereactivity of halogen atom in the ascendingorder isa) vinyl chloride < chloroethane

Discussion

47.	The correct sequence which shows decreasing order of the ionic radii of the elements is :
Answer» The correct sequence which shows decreasing order of the ionic radii of the elements is :

Discussion

48.	How to calculate n factor of NaOH in the following reaction:Cl2 + NaOH --> NaCl + NaClO3 + H2O ?
Answer» How to calculate n factor of NaOH in the following reaction: Cl2 + NaOH --> NaCl + NaClO3 + H2O ?

Discussion

49.	Calculate the hydration enthalpy of ions for NaCl(s) from the following data.ΔlatticeH=+788 kJmol−1ΔsolH=+4 kJmol−1
Answer» Calculate the hydration enthalpy of ions for $N a C l (s)$ from the following data. $Δ_{l a t t i c e} H = + 788 k J m o l^{- 1}$ $Δ_{s o l} H = + 4 k J m o l^{- 1}$

Discussion

50.	38.)Acapacitorof capacitance C is charged with thehelp of a 200 V battery. It is then dischargedthrough a small coil of resistance wire embeddedin a thermally insulated block of specific heatcapacity 2.5 x 102 J/kg and mass 0.1 kg. If thetemperature of the block rises by 0.4 K, the valueof C is(1) 500 F(3) 50 F(2) 500 uF(4) 50 uF
Answer» 38.)Acapacitorof capacitance C is charged with thehelp of a 200 V battery. It is then dischargedthrough a small coil of resistance wire embeddedin a thermally insulated block of specific heatcapacity 2.5 x 102 J/kg and mass 0.1 kg. If thetemperature of the block rises by 0.4 K, the valueof C is(1) 500 F(3) 50 F(2) 500 uF(4) 50 uF

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The total value of m for the electrons (n=4) is:- (1)4 (2)8 (3)16 (4)32

Which is more stable, NaCl or AlCl3?

2. 0.30g of an organic compound containing C, H, O on combustion gives 0.44gCO2,0.18gH2O.If the molecular mass of the compound is 60u, what is the molecular formula?

8. How much should the pressures be increased in order to decrease the volume of gas by 5% at constant temperature 5% 5.26% 10% 4.26%

Which of the following statement(s) is/are correct?

31.C6H5ONa + C2H5Cl --> Give the product formed.

The time for half-life period of a certain reaction ,A→ products is 1h.When the initial concentration of the reac†an t 'A' is 2.0 mol L^{-1},how much time does it take for its concentration to come from 0.50 to 0.25 mol L^{-1}, if it is a zero order reaction

117.The root mean square velocity of hydrogen molecule at 27^°C is vh and that of oxygen at 402^°C is vo then what's the ratio of vh and vo?

When a change is brought about in pressure, temperature or concentration of a reversible reation which has attained equilibrium, the equilibria tries to shift in such a direction which would neutralize the effect of change. This is known as

For which of the following reaction, KpKc ratio is maximum?

in which of the following metamerism is not possible?(a)C4H10O(b)C4H11N(c)C5H10O(d)C3H7ClGIVE REASON.

49. C6H5Cl is least reactive towards OH- what is the reason?

100 ml of a gaseous hydrocarbon on complete combustion gave 300 ml of co2 (g) . The no of atoms of carbon per molecule of the hydrocarbon would be A.1 B.2 C.3 D.4

1.What is the number of surrounding atoms of each carbon atom in ethyne?

Calculate the molality of a 1 L soluttion of 93% H2SO4 (w/V) . The density of the solution is 1.84 g mL−1

20.what is the basic approach to find colourless/ coloured species ? it is correct to find the unpaired electron if present then coloured otherwise not

What is dry hydrogen chloride?

Mechanism for reduction of benzoic acid using LiAlH4

Select the right expression for determining the Packing fraction (PF) of NaCl unit cell (assume an ideal crystal), if the ions along an edge diagonal are absent: (Where r+ represents the radius of the cation and r− represents the radius of the anion)

At 90∘C, pure water has[H3O+]=10−6 molL−1. What is the value of Kw at 90∘C?

The dipole moment of phenol is smaller than that of methanol. Why?

The value of vanderwaal’s constant ‘a’ for the gases O2,N2,NH3 and CH4 are 1.360, 1.390, 4.170 and 2.253 L2 atm mol−2 respectively. The gas which can most easily be liquefied is

why does resonance in air column occur repeatedly in the ratio of 1:3:5:7 and so o

Fill in the blanks with a suitable conjunction. Do good unto others………... forget.

What is discontinuous variation??

Draw the structure of a hexadentate ligand and show the donor atoms. (2)

A catalytic poison renders the catalyst ineffective because

if 8 gm O2 diffuses from a pin hole how much H2 will diffuse under similar condition

Which of the following compounds has the lowest boiling point?

100 mL of 0.01 M CH3COOH and 200 mL of 0.02 M CH3COONa are mixed to form a buffer solution. 700 mL of water is added to this solution. The pH before and after dilution are:(pKa = 4.74, log 4 =0.6)

Consider the fission of byfast neutrons. In one fission event, no neutrons are emitted and thefinal end products, after the beta decay of the primary fragments,are and.Calculate Q for this fission process. The relevant atomic andparticle masses are m=238.05079 um=139.90543 um= 98.90594 u

57 0.1 M solution of glucose was found to be isotonic with a solution of X in 100 g water.Calculate relative lowering in vapour pressure of solution of X in water.

Write any four methods to cook raw food items.

The set of values of x for which the function f(x)=log[x+12]|x2−5x+6| is defined is (where [.] denote the greatest integer function)

The IUPAC name of the compound CH2(COOH)2 is

CH3C≡CHNaNH2−−−−−→XCH2CH2Br−−−−−−−→Y. Identify the product 'Y' is

27.A: 2- bromo butane on reaction with alcoholic koh mainly gives 2- butene R: the hydrogen on c3 carbon is more acidic than the hydrogen on c1 carbon

Did Dobereiner's triads also exist in the columns of Newlands octaves

NaCl is ionic solid, edge length of NaCl is x then the number of atoms which are located at the face centre of the unit cell in 58.5 g of NaCl is equal to ×1023atoms.

A nucleus with mass number 240 breaks into two fragments, each of mass number 120. The binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. Energy released in the process is

2. In certain solidthe oxide ions are arranged in CCP cation a ocvupy 1/6 pgf tetrahedral void a n cation b occupy 1 third of octahedral void formula of compond is .

43) The set of compounds in which thereactivity of halogen atom in the ascendingorder isa) vinyl chloride < chloroethane

The correct sequence which shows decreasing order of the ionic radii of the elements is :

How to calculate n factor of NaOH in the following reaction:Cl2 + NaOH --> NaCl + NaClO3 + H2O ?

Calculate the hydration enthalpy of ions for NaCl(s) from the following data.ΔlatticeH=+788 kJmol−1ΔsolH=+4 kJmol−1